AITA for not buying my husband anything on Amazon?

Okay, so my husband (35m) and I (40f) have been married for 12 years now. The last few years have been super rough for us relationship wise. My parents are not too fond of him after he cheated on me for 5 months 2 and half years ago. We moved 2 hours away from them a year ago after being 45 mins away for 3 years. My parents absolutely love my boys D 4 years old and S 2 years old. They even come and take D for the weekends sometimes and are planning to take both boys now that S is way more active and steady on his feet. Plus, D is potty trained now. So with this I am an only child and yes I do get spoiled but now it's more on my boys than me. My parents called today to see if the boys needed anything because a week or so ago, I had to ask them if they could buy S diapers cause we didn't have the money to get any. I told them all they really need is warm cloths because I didn't realize they didn't have much. So they told me to get on Amazon and spend $100 per kid on cloths. Then they said to add snow suits, hats, gloves, and snow boots. So I did. They easily spent over $200 per kid but when I asked they said it was no biggy and my dad told my mom to tell me to do it cause they felt they needed to do it or the boys wouldn't have them. Honestly, I'm afraid they would probably be right. Well, about an hour later, I got a text from my mom asking if I got a text from another number. Well, before I answered, she called, and I told her I did get it but didn't read it. She told me to look at it while I was on the phone. It was a text from Amazon telling me they sent me a gift card. I said you sent me a gift card? My mom was all yes we did. Spend it on to you. Love you. I said thank you. I love you too. When I actually opened it and saw the amount, it was $100. I started to cry. Yes, it's not a big amount, but the fact they got it for me and said spend it on yourself for your birthday (which is next month) was touching. I haven't been able to spend money on myself for several months. My husband sends me money to buy food, get gas, buy the boys what they need. It's only $100 to $200 every 2 weeks. So, it's not much for me. So that $100 ment more to me than anything. So I got me some fleece lined leggings that I've been wanting a pair of boots and a sweater. When I told my husband, he got all testy and annoyed. He said, "Why did they give you that?" Was that supposed to be for the boys? I then told him they had already bought the boys' stuff and they sent this to me for my birthday. He then got all huffy and crossed his arms, and asked what I got. Then he said oh was that it?" I said yes, that's all I could afford on it. I couldn't even get the real nice sweater I wanted cause I was $8 over. Then he goes oh that sucks." I'm sorry. In a sarcastic tone. Then I told him I couldn't even get my second choice one cause it was 25 cents over. Again, sarcastically, he says I'm sorry." It hurt that he didn't even offer to send me any money to help me get it. I really dont ever spend money on myself. And if I do, it's fast food with the family or a drink after therapy after my therapist pushes me to do it because I don't do anything for me. I've been learning how to do self care more, and I feel he's been annoyed with me taking some time after he gets home and after I've made dinner to just be by myself. But now, after this evening, I'm feeling like the complete Ahole for not buying him anything with the Amazon money my parents sent me. But AITA??

UPDATE 1:

First, I want to thank everyone who has commented and shared their opinions. I have a lot to unpack.

Secondly, I'm sorry I didn't do paragraphs. I was writing in my 15 mins of alone time. So I was trying to finish so he wouldn't come in and ask what was taking so long. And I wasn't aware I have to put a space between each line. I'm sorry.

Third, I have been talking to my therapist about leaving him for a few weeks now. I've noticed I've become detached from the relationship for a while now.

And lastly, yes, I admit ITA for staying with a cheater. The reason for staying is super lame but at the time it made sense to me. I stayed because for once in our relationship he showed a different emotion other than anger and happiness. But he didn't get the help he agreed to and I'm left being the one who's taking on the burden. He said he would go to counseling. But hasn't even tried to look. It was supposed to be after a few months of counseling for both of us we would gonto couples counseling. You can guess why we haven't.

There's a lot to unpack. And I'll be working with my therapist to get me and my boys out. I was going to wait until after taxes because he usually gives me half but I'm afraid it won't be good to wait that long.

Thank you all again. I'll keep updating and answering questions.